1. Jewelry has a broad sense and a narrow sense. Jewelry in a narrow sense only refers to jade products. Jewelry, handicrafts or other valuable treasures in a broad sense are made of gold, silver and natural materials (minerals, rocks, organisms, etc.). ), should be collectively referred to as jewelry. Therefore, in ancient times, there was a saying of "gold education silver ornaments" to distinguish gold and silver from jewelry. Jade is a precious mineral. The embellishment of jade can eliminate impetuous heart, the color of jade can delight bored heart, and the purity of jade can purify dirty heart. Therefore, a gentleman loves jade and hopes to find natural aura in the jade body. Jade is the beauty of stone, with positive, moist and pure color. The same is true of precious stones. Its value does not depend entirely on the composition, and most jadeites are worthless. 3. Jewelry classification: Jewelry is divided into natural jewelry, jade and artificial products. Natural gems: diamond, ruby, sapphire, golden green cat's eye, beryl, emerald, tourmaline, opal, chalcedony, Hebi, etc. 17 kinds. Natural jade: Huang Longyu, agate, jasper, Lingbi jade, Hetian jade, Shi Ying, etc. Natural organic gems: amber, pearl, coral, ivory, coal jade, etc.